30221020 has 48 divisors (see below), whose sum is σ = 67858560. Its totient is φ = 11271744.

The previous prime is 30221003. The next prime is 30221033. The reversal of 30221020 is 2012203.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 30220988 and 30221006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24867 + ... + 26053.

It is an arithmetic number, because the mean of its divisors is an integer number (1413720).

Almost surely, 2^30221020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33929280).

30221020 is an abundant number, since it is smaller than the sum of its proper divisors (37637540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30221020 is a wasteful number, since it uses less digits than its factorization.

30221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 30221020 is about 5497.3648232585. The cubic root of 30221020 is about 311.4844515581.

Adding to 30221020 its reverse (2012203), we get a palindrome (32233223).

The spelling of 30221020 in words is "thirty million, two hundred twenty-one thousand, twenty".